21.硝酸酯类与β受体阻断药联合应用抗心绞痛的药理依据是

A.消除反射性心率加快                                    B.降低室壁肌张力

C.缩短射血时间                                               D.以上都是

22.阿卡波糖降糖作用机制是

A.促进胰岛素释放                                           B.促进组织摄取葡萄糖

C.抑制α葡萄糖苷酶                                        D.增加肌肉对胰岛素的敏感性

23.喹诺酮类药物不宜应用于

A.溃疡病患者                                                  B.肝病患者  

C.婴幼儿                                                         D.老年人

24.用于控制疟疾发作的最佳抗疟药是

A.氯喹                                                             B.奎宁  

C.伯氨喹                                                         D.青蒿素

25.糖皮质激素用于严重细菌感染的主要目的是

A.加强抗菌素的抗菌作用

B.提高机体的抗病力

C.直接对抗内毒素

D.抗炎、提高机体对细菌内毒素耐受力，制止危重症状发展

26．磺胺类药物的作用机制是与细菌竞争

A.二氢叶酸合成酶                                           B.二氢叶酸还原酶

C.四氢叶酸合成酶                                           D.四氢叶酸还原酶

27．下列最易引起水电解质紊乱的药物是

A.氢氯噻嗪                                                      B.呋塞米      

C.螺内酯                                                         D.氨苯蝶啶

28．在体内外均有抗凝血作用的凝血药物是

A.氨甲苯酸                                                      B.双香豆素  

C.华法林                                                         D.肝素

29.强心苷中毒时所致的快速型室性心律失常的首选药为

A.苯妥英钠                                                      B.胺碘酮      

C.普萘洛尔                                                      D.维拉帕米

30．口服下列那种物质有利于铁的吸收

A.维生素C                                                      B.牛奶  

C.茶                                                                D.咖啡